I checked out their FB page, the cast was performing in Japan at the time! (I really like this little dancing icon)

Yuzu sent the bouquet earlier this month when the cast was performing in Tokyo Theatre. Here's a bigger resolution of the picture from Notre Dame official Japanese twitter. Seems that the one who's assigned to perform the musicals in Japan is the Canadian cast. So he might've gotten the wind of the play from one of his Canadian acquaintances or have attended one of their plays before while in Canada to get some inspiration for his free. Whatever it is, it's really sweet and thoughtful of him to send the bouquet.

Originally Posted by HJJ

Are these casts performing in Japan?

Yes, they are still performing in Japan. Their last show will be somewhere in April, I believe.